<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="./vue.js"></script>
</head>
<body>
  <div id="app"></div>
  <script>
    var vm = new Vue({
      // el: '#app',
      el: document.querySelector('#app'),
      data: {
        msg: 'hello',
        age: 18
      }
    })
  </script>
</body>
</html>
